RG

IN CONTEXT

BRANCH

Physics

BEFORE

11th century Alhazen shows that light travels in straight lines.

1630 René Descartes proposes a wave description of light.

1660 Robert Hooke states that light is a vibration of the medium through which it propagates.

AFTER

1803 Thomas Young describes experiments that demonstrate how light behaves as a wave.

1864 James Clerk Maxwell predicts the speed of light and concludes that light is a form of electromagnetic wave.

1900s Albert Einstein and Max Planck show that light is both a particle and a wave. The quanta of electromagnetic radiation they recognize become known as “photons.”

In the 17th century, Isaac Newton and the ...

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